Systems and methods for determining physiological characteristics of a patient using pulse oximetry
First Claim
1. A method for controlling an electronic device to operate an external sensor to obtain one or more vital signs, the electronic device having an audio interface comprising a plurality of contacts, the external sensor connectable to the audio interface and comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths, the method comprising:
- applying a harmonic driving signal to a first contact and a second contact of the audio interface for driving the one or more emitters of the external sensor, the harmonic driving signal comprising a first sinusoidal driving signal applied to the first contact of the audio interface and a second sinusoidal driving signal to the second contact of the audio interface, the first and second sinusoidal signals being substantially 180 degrees out of phase;
receiving the response signal at a third contact of the audio interface;
demodulating and demultiplexing the response signal into a first wavelength response signal and a second wavelength response signal;
analyzing the first and second wavelength response signals to determine one or more vital signs; and
outputting the determined one or more vital signs.
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Accused Products
Abstract
Methods, systems and related apparatus are provided to enable an electronic device to operate an external sensor comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths connectable to an audio interface by applying a harmonic driving signal to a first contact and a second contact of the audio interface for driving the emitters of the external sensor, receiving the response signal at a third contact of the audio interface, demodulating and demultiplexing the response signal into a first wavelength response signal and a second wavelength response signal, analyzing the first and second wavelength response signals to determine one or more vital signs, and outputting the determined one or more vital signs.
28 Citations
23 Claims
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1. A method for controlling an electronic device to operate an external sensor to obtain one or more vital signs, the electronic device having an audio interface comprising a plurality of contacts, the external sensor connectable to the audio interface and comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths, the method comprising:
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applying a harmonic driving signal to a first contact and a second contact of the audio interface for driving the one or more emitters of the external sensor, the harmonic driving signal comprising a first sinusoidal driving signal applied to the first contact of the audio interface and a second sinusoidal driving signal to the second contact of the audio interface, the first and second sinusoidal signals being substantially 180 degrees out of phase; receiving the response signal at a third contact of the audio interface; demodulating and demultiplexing the response signal into a first wavelength response signal and a second wavelength response signal; analyzing the first and second wavelength response signals to determine one or more vital signs; and outputting the determined one or more vital signs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for controlling an electronic device to operate an external sensor to obtain one or more vital signs, the electronic device having an audio interface comprising a plurality of contacts, the external sensor connectable to the audio interface and comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths, the system comprising:
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a driving signal generator configured to apply a harmonic driving signal to a first contact and a second contact of the audio interface for driving the one or more emitters of the external sensor, the harmonic driving signal comprising a first sinusoidal driving signal applied to the first contact of the audio interface and a second sinusoidal driving signal to the second contact of the audio interface, the first and second sinusoidal signals being substantially 180 degrees out of phase; a response signal demodulator and demultiplexer configured to receive the response signal from a third contact of the audio interface and demodulate and demultiplex the response signal into a first wavelength response signal and a second wavelength response signal; a response signal analyzer configured to analyze the first and second wavelength response signals to determine one or more vital signs; and an output configured to output the determined one or more vital signs. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification